The side lying track strengthens weak abdominal obliques, erector spinae, multifidi, and quadratus lumborum. It is important to maintain a neutral pelvis and not to arch the back. Perform the movements in a slow and controlled manner. You will want to work towards maintaining 2 minutes of activity.
WARNING: This exercise is NOT recommend in cases of spinal stenosis, acute phase disc herniation, or acute low back strain/sprain. Discontinue if back pain is aggravated.